Dr. Mikhail Sergeyevich Cossack (Ｄｒ．ミハイル・セルゲイビッチ・コサック Dokutā Mihairu Serugeibitchi Kosakku?, rus. Михаил Сергеевич Казак) is a Russian robotics engineer affiliated with the Stravinsky Science Academy, and lives with his daughter, Kalinka. His hobby is watching ballet.